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Positive electrode of secondary battery, and secondary battery using same

a secondary battery and positive electrode technology, applied in the direction of positive electrodes, active material electrodes, cell components, etc., can solve the problems of significant deterioration in capacity, insufficient low temperature output characteristics, and insufficient etc., to achieve excellent high temperature cycle characteristics, excellent low temperature output characteristics, and excellent durability

Active Publication Date: 2020-12-10
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure provides a positive electrode that can improve the low temperature output, high temperature cycle, and durability of a secondary battery against high voltage. This results in an improved performance of the battery.

Problems solved by technology

As a result of diligent research, the inventors of the present disclosure found that secondary batteries including positive electrodes obtained using conventional positive electrode materials exhibit increased resistance at low temperatures and are insufficient in terms of low temperature output characteristics.
In addition, it was found that in cases where such secondary batteries are repeatedly charged and discharged at high temperatures, there is a significant deterioration in capacity and high temperature cycle characteristics are insufficient.
Furthermore, it was found that such secondary batteries exhibit increased resistance when operated at high voltages and are insufficient in terms of durability against high voltage.

Method used

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  • Positive electrode of secondary battery, and secondary battery using same
  • Positive electrode of secondary battery, and secondary battery using same
  • Positive electrode of secondary battery, and secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Production of Coated Particle

[0077]First, LiNi1 / 3Co1 / 3Mn1 / 3O2 particles having a layered structure were produced as positive electrode active substances in accordance with a conventional method.

[0078]Specifically, sulfates of Ni, Co and Mn were dissolved in water at a Ni:Co:Mn molar ratio of 1:1:1. By neutralizing this solution through addition of NaOH, a composite hydroxide containing Ni, Co and Mn was precipitated as a precursor of a positive electrode active substance. The obtained composite hydroxide and lithium carbonate were mixed at a molar ratio of 1:1. LiNi1 / 3Co1 / 3Mn1 / 3O2 particles having a layered structure were obtained by firing this mixture for 15 hours at a temperature of 800° C. The average particle diameter (D50) of these LiNi1 / 3Co1 / 3Mn1 / 3O2 particles was measured by means of a laser diffraction scattering method, and found to be 10 μm.

[0079]Next, the LiNi1 / 3Co1 / 3Mn1 / 3O2 particles having a layered structure were placed in a mechanochemical apparatus together with a t...

examples 2 to 36

[0091]Evaluation lithium secondary batteries were produced in the same way as in Example 1, except that LiNi1 / 3Co1 / 3Mn1 / 3O2 particles were coated with the titanium-containing compounds shown in Table 2 and oxide particles shown in Table 2 were used.

examples 37 to 45

[0092]Evaluation lithium secondary batteries were produced in the same way as in Example 1, except that a lithium-titanium composite oxide (Li / Ti atom number ratio=1) was used as the titanium-containing compound and TiO2 having the average particle diameters shown in Table 3 were used as oxide particles.

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Abstract

A positive electrode imparts secondary battery with low temperature output characteristics, high temperature cycle characteristics and durability against high voltage. A positive electrode of secondary battery includes positive electrode current collector and positive electrode active substance layer on positive electrode current collector. The positive electrode active substance layer contains positive electrode active substance particles and oxide particles which are dispersed in positive electrode active substance layer as separate particles from positive electrode active substance particles. The positive electrode active substance particles each include coating of titanium-containing compound at the surface. The titanium-containing compound in coating is at least one compound selected from group consisting of TiO2, TinO2n−1, wherein n is integer of 3 or more, and oxides containing Li and Ti. The oxide particles include at least one oxide selected from group consisting of TiO2, TimO2m−1, wherein m is integer of 3 or more, and oxides containing Li and Ti.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The present disclosure relates to a positive electrode of a secondary battery. The present disclosure also relates to a secondary battery using the positive electrode. It should be noted that this application claims priority on the basis of Japanese Patent Application No. 2019-106060, which was filed on Jun. 6, 2019, and the entire contents of that application are incorporated by reference in this specification.2. Description of the Related Art[0002]In recent years, secondary batteries such as lithium secondary batteries have been advantageously used as portable power sources for personal computers, handheld devices, and the like, and as motive power sources for vehicles such as electric vehicles (EV), hybrid vehicles (HV) and plug-in hybrid vehicles (PHV).[0003]As secondary batteries such as lithium secondary batteries have become more widespread, there have been demands for higher performance. In general, positive electrode...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/36H01M4/485H01M4/48H01M10/0525H01M4/131
CPCH01M4/483H01M10/0525H01M2004/028H01M4/485H01M4/366H01M4/131H01M4/628H01M4/525H01M4/505H01M2004/021Y02E60/10
Inventor HORIKAWA, DAISUKEYAMAMOTO, YUJITERANISHI, TAKASHI
Owner TOYOTA JIDOSHA KK
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